I needed these types of feet for a Caldwell Rock BR Competition Rifle Front Shooting Rest base used in F-Class. The challenge was these are 3/8-16 TPI threads and my existing rest is threaded for M10-1.5. A quick check of the thread tables in Machinerys Handbook yielded there is enough delta between the two Threads. So, I chucked up the feet in My Grizzly Lathe (G4003) and opened the holes to about a 68% TE and re-threaded them to M10-1.5 (use a plug then a bottoming tap). These feet are solid, well-made and coated. Good Job Grizzly and as much as I love making chips at this price ($39.95) I was not going to make them! Yes I would buy them again but outside of another rest or a nuclear holocaust these things will last indefinitely and be found by an archeologist in the future.